Reconfigurable optical add/drop multiplexor and optical switching node

摘要

A colorless, directionless ROADM includes a pair of contentioned add and drop wavelength-selective optical switches, an input wavelength-selective optical switch having one input port, and an output wavelength-selective optical switch having one output port. Unintended input-to-output port couplings, which appear in the “contentioned” add and drop switches, can be mitigated by the input and output wavelength-selective optical switches carrying the through traffic.

主权项

1. A reconfigurable optical add/drop multiplexor (ROADM) comprising:
at least one input wavelength-selective switch (WSS) including an input port for inputting a plurality of input wavelength channels and a plurality of intermediate ports,
the at least one input WSS being configured for independently redirecting the plurality of input wavelength channels to the plurality of intermediate ports for output as through wavelength channels or DROP wavelength channels; at least one ADD switch, each at least one ADD switch comprising:
a plurality of first ingress ports for launching ADD wavelength channels, anda plurality of first egress ports for outputting the ADD wavelength channels, at least one DROP switch, each at least one DROP switch comprising:
a plurality of second ingress ports, one of which coupled to one of the plurality of intermediate ports of the at least one input WSS for receiving the DROP wavelength channels,a plurality of second egress ports for outputting the DROP wavelength channels,an array of directors for redirecting the DROP wavelength channels to a selected second egress port of the plurality of second egress ports, anda wavelength-selective coupler for coupling the plurality of second ingress ports to the array of directors and coupling the array of directors to the plurality of second egress ports,each director, of the array of directors, corresponding to a wavelength and is disposed, with respect to the wavelength-selective coupler, for receiving wavelength channels at the corresponding wavelength at a single location from any one of the plurality of second ingress ports, andat least one of:
the input port and the plurality of intermediate ports are arranged in a single row,the plurality of first ingress ports and the plurality of first egress ports are arranged in a single row, orthe plurality of second ingress ports and the plurality of second egress ports are arranged in a single row; and a controller for controlling wavelength channel routing between the input WS S, the at least one ADD switch, and the at least one DROP switch.